[Cuis-dev] Cuis won't launch on CogSpur Arm64 MacOS when not using mixed arithmetic

[Alan Dao]

Looks like you were right, I reported it to vm-dev yesterday and Eliot
Miranda pushed a fix for it today.

Best,
Alan

On Thu, Nov 3, 2022 at 6:19 AM Juan Vuletich <juan at cuis.st> wrote:

> Hi Alan,
>
> On 11/3/2022 4:20 AM, Alan Dao via Cuis-dev wrote:
>
> Hey all,
>
> I've recently switched to an Arm64 Macbook. One of the first things I did
> on it was launch the latest base image of Cuis (6.0-5542). To my surprise,
> the Arm64 CogSpur VM crashes when launching the base image. However, the
> Stack VM successfully launches the base image. I looked at the crash.dmp
> and saw that the CogSpur crash was happening in
> SystemDictionary>doMixedArithmetic. In the base image, this method is
> called with a False value from SystemDictionary>doStartUp.
>
> I used the Stack VM to change the image such that
> SystemDictionary>doMixedArithmetic is called with a True value. After
> this, I was able to successfully launch the MixedArithmetic image on my
> Arm64 Macbook.
>
>
> This looks like a VM bug. You can confirm this by using Squeak or Pharo,
> and doing `Smalltalk doMixedArithmethic: false`. It should also crash. Same
> with the Cuis image you were able to start by setting it to true. If so,
> please report the bug in vm-dev:
> http://lists.squeakfoundation.org/mailman/listinfo/vm-dev
>
> Does anyone know why using mixed arithmetic isn't the default? To my
> surprise, the base images for Pharo and Squeak were able to launch without
> any modifications, so I'm assuming they're by default using mixed
> arithmetic.
>
>
> The explanation is in the comment at #doMixedArithmetic. Please take a
> look. It is about letting the image (and not the VM) handle arguably
> decisions WRT conversions between number types. If you find it cryptic or
> have further questions, please ask here.
>
> I've attached my crash.dmp to this email for those who're curious.
>
> Best,
> Alan
>
>
> I'm pretty sure you are the first to exercise this corner of the VM.
> Please report in vm-dev. I'm sure they'll fix it.
>
> Thanks,
>
> --
> Juan Vuletichcuis.stgithub.com/jvuletichresearchgate.net/profile/Juan-Vuletichindependent.academia.edu/JuanVuletichpatents.justia.com/inventor/juan-manuel-vuletichlinkedin.com/in/juan-vuletich-75611b3twitter.com/JuanVuletich
>
>
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